Re: [CentOS] This firewall rule will self-destruct

On Friday 16 March 2007, MrKiwi wrote:

mitigate a situation where you have no control over an intermediate firewall that only passes port 80

Yes, that's EXACTLY what I'm trying to do... but I dont' see how this exactly relates to port knocking.

Port knocking seems to be that you log connection attempts to various ports that are otherwise closed, EG:

iptables -I input -p tcp -j DENY -l

and then watch the log file for a specific, exact sequence of connections from a common source IP. How would that help me here? Are you suggesting that I log the inbound port 80, and then watch the logfile with a background script/daemon to clear out the rules?